How Can I Call A Method In Usercontrol

May I suggest you review the discussion of the use of the 'internal access modifier here:

http://stackoverflow.com/questions/165719/practical-uses-for-the-internal-keyword-in-c-sharp

and modify your question so that you give your reason for using 'internal.

Is it clear to you that in the context in which an instance of a UserControl is created all the methods, and fields, declared 'internal and 'public are visible/usable within that context ?